IIRC there’s been an order for a single A380 for an unidentified customer on Airbus’ books for a while. It wouldn’t make sense for any airline to order just one and IIRC the single order had been linked with Roman Abramovich. What happened with that?
I'm not familiar with the specific instance that you refer to, but another article on this story offers this snippet:
Saudi Prince Buying 'Flying Palace' Jet
The airline company said it expects at least six other A380 VIP jets to be sold to clients in the Middle East, and Central and South Asia.